package com.whf.android.jar.util;

import androidx.annotation.NonNull;

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;

/**
 * sha256加密
 *
 * @author Stone
 * @version V1.0
 */
public class SHA256Util {

    /**
     * 　　* 利用java原生的摘要实现SHA256加密
     * 　　* @param str 加密后的报文
     * 　　* @return
     *
     */
    public static String getSHA256StrJava(String str) {
        MessageDigest messageDigest;
        String encodeStr = "";
        try {
            messageDigest = MessageDigest.getInstance("SHA-256");
            messageDigest.update(str.getBytes(StandardCharsets.UTF_8));
            encodeStr = byte2Hex(messageDigest.digest());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return encodeStr;
    }

    /**
     * 　　* 将byte转为16进制
     * 　　* @param bytes
     * 　　* @return
     *
     */
    @NonNull
    private static String byte2Hex(@NonNull byte[] bytes) {
        StringBuilder stringBuffer = new StringBuilder();
        String temp = null;
        for (byte aByte : bytes) {
            temp = Integer.toHexString(aByte & 0xFF);
            if (temp.length() == 1) {
                //1得到一位的进行补0操作
                stringBuffer.append("0");
            }
            stringBuffer.append(temp);
        }
        return stringBuffer.toString();
    }
}
